Conciseness

The body is lean and assumes Claude's competence: every section is either executable code with minimal one-line comments, a data table (voices, providers) with library-specific values, or terse best-practice bullets. No concepts Claude already knows are explained, matching 'Lean and efficient; every token earns its place'; it is not anchor 4 because there is no over-explanation to trim.

Actionability

The content is fully executable and copy-paste ready: concrete chat commands ('/speak "Market alert" --voice rachel'), complete TypeScript calls for createTTSService, synthesize, speak with options, streaming, listVoices, preview, queue management, and SSML — covering the common cases. This matches 'Fully executable; copy-paste ready code or commands; specific examples cover the common cases'.

Workflow Clarity

The core single action (synthesize/speak text) is unambiguous with concrete invocations for each provider, and provider setup per platform is clearly laid out. However, there are minor validation gaps: no explicit checkpoint for verifying ELEVENLABS_API_KEY presence before use, and the fallback guidance ('Use say/espeak if ElevenLabs unavailable') is a bullet without steps. This fits 'Clear sequence with most checkpoints present; minor validation gaps' rather than 5 (no error-recovery feedback loop) and clearly above 3 (the happy path is fully concrete).

Progressive Disclosure

The SKILL.md is a ~220-line complete API reference inlined in the main file with good section headers but no bundle files at all (no references/, scripts/, or assets/ exist). The voice table, provider table, and full API reference are content that clearly belongs in separate reference files — matching 'Some structure but could be better organized; ... content that should be separate is inline' (cf. the '200 lines of API reference that could be in a separate file' example). It is above anchor 2 because section headers make it navigable, and below anchor 4 because none of the bulk reference material is split out.

Specificity

The phrase 'Text-to-speech synthesis with ElevenLabs and system voices' names the domain and one concrete action (synthesis) plus the providers, matching the 'names domain and 1-2 concrete actions, but not comprehensive' anchor (cf. 'Processes PDF files and extracts content'). It is above anchor 2 because 'synthesis' is a concrete action, not merely generic processing, but below anchor 4 because no other capabilities (voice listing, streaming, queueing) are mentioned.

Completeness

There is a clear 'what' (speech synthesis via ElevenLabs and system voices) but no 'Use when...' clause or equivalent trigger guidance, so completeness is capped at 3 per the guideline ('A missing "Use when..." clause or equivalent explicit trigger guidance should cap completeness at 3'). It is above anchor 2 because the 'what' is concrete, and below anchor 4 because no 'when' guidance is present even weakly.

Trigger Term Quality

Relevant keywords exist ('Text-to-speech', 'synthesis', 'ElevenLabs', 'voices'), but common natural phrases users would say are missing — 'read aloud', 'speak', 'say', 'TTS', 'audio'. This matches 'Some relevant keywords but missing common variations or synonyms' (cf. 'Works with PDF files'); it is below anchor 4 because the everyday phrasings users naturally use are absent.

Distinctiveness Conflict Risk

Speech synthesis with named providers (ElevenLabs, system voices) is a fairly distinct niche with little chance of triggering for the wrong skill, matching 'Mostly distinct; minor overlap risk with closely related skills'. It is below anchor 5 because the description is terse and does not carve out an unmistakable trigger boundary, and above anchor 3 because it is more specific than a generic 'works with document files' style description.